Calipers and dividers



(No Model.)

0. STODDARD. GALIPERS AND DIVIDERS.

'No. 314,625. Patented Mar. 31, 1885.

Witnesses w QM Inventor:

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'OSCAR STODDARD, OF DETROIT, MICHIGAN.

GALIPERS AND DIVIDERS.

SPECIFICATION forming part of Letters Patent No. 314,625, dated March 31, 1885.

Application filed November 4, 1884.

(No model.)

I the letters and figures of reference marked thereon,which form apart of this specification.

The object of my present invention is to construct a compass (for mechanical purposes) that will be durable and may be readily adjusted to meet all the requirements necessary to the complete workings of all implement of this class; and my present invention consists in the arrangement or combination of parts, and in the novel way of attaching to and operating or adjusting the position of the legs proper of a compass.

In the drawings forming a part of this specification, Figure 1 is a perspective of my invention,with a change of position in dotted lines. Figs. 2, 3, 4, and 5 are enlarged detached portions in perspective of the parts embodying my invention.

In Fig. 1, A A represent the legs proper of my compass, which are jointed at the top in the usual way. Said legs are hollow from end to end, as indicated by dotted lines in the upper portion of said legs.

B B are the extension-legs,which are round,

and made to slide freely through the legs A A, for the purpose of lengthening or shortening the capacity of the compass.

E E are the common chucks or tighteningrings for securing the legs A B together as may be desired. I provide one of the legs, B, at the lower end, with a recess or opening, 8, which is filled loosely by the web on of the arm 0, and is pivoted within said leg by means of the rivet d. Passing through the leg is a thumb-screw, a, which, when inserted, engages with the webbed portion at of the arm 0, for the purpose of holding said arm when adjusted, as hereinafter set forth. The lower portion of the arm 0 terminates in the form of a cup or thimble, being internally screwthreaded, as shown at 9* of Fig. 2, into which the metal point It or the upper end of a pencil may be secured, as desired.

' As a means for opening and closing the compass I attach pivotally to the legs AA, at about midway of the full length of the com pass, the adj listing-arms S S, the upper ends of which are united and held by a set-screw, 9. (See Fig. 1.)

At the left of Fig. 1, .2 represents a station ary or fixed ear, to which one end of the spreader or adjusting-armis pivoted. This construction I design using upon the cheaper compasses. At the right I show a metal yoke, D. (See also Fig. 5.) Said yoke is made sufficiently large to slide freely over the leg proper of a compass, and is provided with parallel arms or ears t 15, between which the lower end of the adjusting-arm S is se cured movably by means of the thumb-screws 'v t. The yoke D is so constructed that the tightening of the set-screw 11 will cause said yoketo impinge upon or grasp firmly the leg of the compass, and at the same time allow the adj usting-arm S to work freelywithin the yoke, and by using the yoke D on each leg the thumb-screw 1) may be loosened,when the position of the adjusting-arms may be raised or lowered, thus increasing and decreasing the opening capacity of the compass; or the adj listing-arms and thimbles may be readily attached to the common compass now in the market.

In the compass it is often necessary to have the marking-point stand vertically, especially when the legs are well apart. To accomplish this I pivot the arm G, having the web it, to the leg of a compass, and when extended, as shown by dotted lines of Fig. 1, the thumb screw a is loosened,when the arm 0, supporting the point h, will assume the vertical position shown, when the point is securely held by the thumb-screw a pressing against the web a of the arm 0.

To open the compass, the thumb-screw g is first loosened, when the legs may be spread to the desired position, and held there by tightening said thumb-screw.

It will also be observed that by this construction I am able to form the legs A Ahollow their entire length, and by inserting within said legs the extensioniegs B B the capacity of the compass is doubled.

Having thus fully described my present invention, what I claim as new, and desire to secure by Letters Patent. is-- 1. In combination with the legs ofa com- 5 pass, the adjusting-arms pivotally attached to said legs by means of the metal yokes D, having arms it, and set-screws, as specified, said adjusting-arms secured at their upper end by a set-screw, as and for the purposes specifi d.

2. In combination with the hollow legs A A of a compass, the adjusting-arms pivoted thereto, said arms united and adjustably held by the set-screw g, the extension-legs B B, adjustably secured within the hollow legs, and the 15 pivoted arm 0, having the'internally-screwthreaded portion 1', adapted to receive a pencil or point, h, when constructed substantially as set forth.

3. In combination with the leg of a compass having the recess a, the arm 0, provided with the Web n, pivotally attached Within said recess, and adjust-ably held by the set-screw a, said arm provided with the internally-screwthreaded portion 1', for holding a point or pen oil, as and for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

osoAn SIODDARD. 

